You're a teen, and you're down. But how is anybody else supposed to know that? Enter Who's Down, a new invite-only app from up-and-coming social networking company Google, Inc. The app, which is more or less a direct rip of Danny Trinh's Free, lets you broadcast your down-ness to fellow teens by tapping a toggle to signal your immediate availability for whatever. If your friends continue ignoring you, you can invite them to specific categories of hangouts, either by choosing from a Google recommendation ("Anyone down to grab tacos?") or proposals of your own (Netflix and chill?)